Baryonic content of the pion
Metadatos
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Elsevier
Fecha
2021-09-27Referencia bibliográfica
P. Sanchez-Puertas, E. Ruiz Arriola and W. Broniowski. Baryonic content of the pion. Physics Letters B 822 (2021) 136680 [https://doi.org/10.1016/j.physletb.2021.136680]
Patrocinador
European H2020 MSCA-COFUND 754510,824093,H2020-INFRAIA-2018-1; Polish National Science Centre 2018/31/B/ST2/01022; Generalitat de Catalunya 2017SGR1069; Ministerio de Economía y Competitividad FPA2017-86989-P,SEV-2016-0588 MINECO; European Regional Development Fund FIS2017-85053-C2-1-P ERDF; Junta de Andalucía FQM-225Resumen
The baryon form factor of charged pions arises since isospin symmetry is broken. We obtain estimates for this basic property in two phenomenological ways: from simple constituent quark models with unequal up and down quark masses, and from fitting to e+e−→π+π−data. All our methods yield a positive π+baryon mean square radius of (0.03 −0.04fm)2. Hence, a picture emerges where the outer region has a net baryon, and the inner region a net antibaryon density, both compensating each other such that the total baryon number is zero. For π−the effect is opposite.